swiftlang / swiftlang/swift-corelibs-libdispatch
MSVC ARM64 miscompile in libdispatch needs to be reverted with a fix
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Windows
- Dominant language
- C
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- Merged PRs (30d)
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Description
https://github.com/swiftlang/swift-corelibs-libdispatch/commit/d4147e8992bd7d1b038ef178a6a1d6152d794519 introduced a workaround for a MSVC ARM64 miscompile that we should clean up and revert.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by inspecting commit d4147e8992bd7d1b038ef178a6a1d6152d794519 and the MSVC ARM64 build path it changed. Identify the underlying miscompile and the intended correction before reverting the workaround; done means the workaround is removed and the ARM64 build remains correct.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100